Of horticultural origin, Delphinium × cultorum ‘King Arthur’, commonly known as perennial larkspur, is a tall delphinium from the Pacific Giant group. It stands out for its long spikes of deep violet-blue flowers with a white centre, creating a particularly strong contrast. Its upright growth, considerable height and dense inflorescences make it a structural perennial well suited to the back of borders and planting schemes requiring strong vertical accents.
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GT9
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Available quantity 300 | Dispo à partir de Immédiat | Sold by min 10 |
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Characteristics of Delphinium × cultorum ‘King Arthur’
Delphinium × cultorum ‘King Arthur’ develops a clump of deeply divided green leaves, topped in early summer by tall flower spikes. At maturity, the plant reaches approximately 1.6 m in height and 60 cm in width. Its numerous deep violet-blue flowers feature a contrasting white centre, one of the main distinguishing characteristics of this cultivar. Its strongly upright habit quickly adds height to perennial planting schemes. The above-ground growth dies back during winter before regrowing from the crown in spring. Because of the height of the inflorescences, early staking is recommended in areas exposed to wind or heavy rain.
How to use Delphinium × cultorum ‘King Arthur’?
Delphinium × cultorum ‘King Arthur’ is naturally suited to the middle or back of perennial borders, where its tall flower spikes create a strong vertical accent. Its violet-blue and white colouring combines particularly well with pink, white, yellow or pale blue flowers. It is suitable for mixed borders, English-style gardens and planting schemes featuring tall perennials. Its long stems can also be used as cut flowers. Planting in groups of three to five plants increases the visual impact while making collective staking easier. Growing in large containers is also possible, provided a deep substrate and protection from strong winds are available.
What are the best cultivation tips for Delphinium × cultorum ‘King Arthur’?
Plant Delphinium × cultorum ‘King Arthur’ in full sun or light partial shade, in deep, fertile, moisture-retentive but well-drained soil. Allow approximately 50 to 60 cm between plants. Prepare the soil thoroughly before planting and incorporate well-decomposed compost where fertility needs improvement. Maintain regular soil moisture during active growth and while the flower spikes are developing, without allowing the soil to remain permanently waterlogged. Compost or a suitable perennial fertiliser can be applied in spring. Install supports before the stems reach full height. After the first flowering period, remove faded spikes to encourage a possible second flush later in summer.
